1. Take some hibiscus (china rose or mandara) petals.
2. Take warm water into a beaker and place the petals in the beaker.
3. Keep it until the water has completely turned into violet colour.
4. Filter the solution with a strainer.
5. Now hibiscus indicator is ready to test.
Test with indicator:
1. Take lemon juice, soda water, lime water, glucose solution, sugar solution, soap water etc. into test tubes.
2. Add sufficient amount of hibiscus indicator in each test tube.
3. Observe the change in the colour of the substance and record in the table.
| Name of the substances |
Observed colour change |
| 1. Lemon juice |
pink |
| 2. Soda water |
pink |
| 3. Lime water |
green |
| 4 Glucose solution |
no change |
| 5. Sugar solution |
no change |
| 6. Soap water |
green |
Conclusion :
In acids and bases the hibiscus indicator changes its colour. Hence, it can used as an acid base indicator.
